Magneto.



O. E. JOHNSON.

MAGNETO.

APPLICATION FILED AUG. OO, XOOO Patented Sept. 17, 1912.

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APPLIGA'TION FILED AUG.30,1909.

Patented Sept. 1'?y i912.

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.application filed august 30, 1909.

' .To @ZZ iti/1.0m if; may concern .7de lrno .vn that l, CARL E.Ql'onison, a citizen of theljnited States, residing` Los r-f'tngelesa inthe county of Los ngeles and State of California, have invented nenT anduseful l/l'agneto, of which the following` a specilication.

l`his invention "relates to magnetos and particularly to that type ofmagneto which is einjiloyed in the ignition apparatus of internalcombustion engines. ln such magnetos that circuit has heretofore beenmade and broken by a mechanically operated circuit breaker7 orinterrupter, and the main object of the present invention is to malteand break the circuitl by magnetically operated means, the magnetismused for this purpose being produced by the magneto, the advantagesarisinv 'therefrom being `greater simplicity of the machine on accountof elimination of the more or less comples: circuit breakera eliminationof movingv and wearing` parts7 and perfect action on account of directapplication of force from the magneto. further advantage is that it ispossible to Tary the time of prfulurina` the spariVr through a much`greater are than can be secured by adjusttinel the timers heretoforeemployed.

The invention may be employed in magy netos ivherein a transformer isemployed externally of the magnet@ the armature haring' a prin'iarywindingonly, or where the armature is provided with a primary wimlingand-a so-called secondary Winding,` without an external transformer., or isadapted to bc used in any of the Well-known types of magnetos.

in one form of vthe inreiition employ tivo auxiliary pole pieces inaddition to the regular pole pieces.l for attracting an armature toseparate contact points and brealt the circuit. ln another form ldispense with the auxiliary pole pieces and employ the lower ends ofthelregular poles of the tlf-shaped magnet `for attracting the circuitvcontrollinq armature to separate the contact points; ihe contact pointsare movned together pr xferably by spring' means. ln the v presentembodiment. the poles which attract the circuit controlling' armatureare fixed and bear a constant angular position. By adjusting the regularpole pieces l am enabled to vary the point in the cycle at 'which theelectric pressure Within the armature Specification of Letters Eatent.

nections wherein atented Sept.. 17, 1912, Serial No. 515,329.

Winding attains its maximum value so that excitation of the circuitcontrolling armature will correspond to the adjustment and rtheconsequent attraction of the circuit controlling armature and break ofthe circuit Will occur accordingly.

quick break in the primary circuit is of importance and a further objectis to so construct the device thatv a sudden break is produced in theprimary circuiti. l

Referring to *the drawings: Figure l is a side elevation rof themagneto, partly in section. Fig. 2 is a front. elevation. 3 is adiagrammatic View showing` the method of Winding in which no externaltransformer is employed, there being a primary Winding and a so-calledsecondary Winding on the armature. Fig'. 4 is adi-l agranmiatic viewshowing the armature having a primary Winding` only, there being anexternal transformer. cross section. on line :UL-wi Fig'. Q. Fig. G is adiagrammatic view showing the conth-e arn'iature is Wound with bothprin'iary and secondary coils7 both coils beingv separated from eachother. Fig. 7 is a perspective view of one end of the magneto showingadjacent portions of the circuit controlling parts. Fig. S is aperspective vieu' of the'adjustable pole pieces.

in they form shown in l*1 ig'. l, l designates the regular magnet havingpoles 2 provided with main pole pieces 3 and adjustable portions orshoes at, the. latter fitting' revolubly in the main pole pieces 3 andbeing" connected. at cach end by a. ring from one of 'which an armextends through a slot G to permit the arm 6 to be moved to adjust theshoes, Yillatcs T are secured to .the ends of the box 8 of non-magneticmaterial. Both plates T are of a non-mag netic material. 9 designatesthe armature shaft mounted at each end in bearings l in the plates and7. rEhe armature shaft carries a rotatingV armature of the l-l- Atype.Auxiliary pole pieces l2 are arranged above and beloiv the armature lland are supported by arms 13 which extend through slots formed in thebox 8 and are secured to the end plate i by screws l5.

circuit controlling)` armature 16 is sup- Ved by springs l? and isadapted to be acted by the tivo arms 13 of the auxiliary poN pieces Fig.is ai 18 is astationary conti-actl point supported by a stationarybracket 19, and 20 is a mov-A able contact supportedby' a spring 21,'the

latter being at a distance from the armaturel 16 when the armature 16 isaway from the arms 13 and the armature 16 ris normally held retracted bythe springs 1'?.y rlhe contact points 18 and 20 are located in theprimary circuit and normally keep the primary circuit closed, the spring21 pressing the conf tact 20 against the contact 18. As the armature 11rotates the auxiliary polevpieces 12` are excited twice in eachrevolution of the varifnature and each time they are excited vthe arms13 thereof attract the circuit controlling armature 16 and the latterstrikes the spring 21 with a hammerblow and suddenly moves the Contact20 away trom the contact 18, thereby breakingthe primary circuit and theposition shown in lig. 1, the armature 11 being about to leave one polepiece and enter another and the auxiliary pole pieces 12 beingsubstantially midway between the regular pole pieces 3, so that themaximum magnetic excitation of the auxiliary pole pieces 12 and arms 13will occur at the time of greatest electrical pressure. The springs 17are set to resist closing of the circuitcontrolling armature 16, exceptwhen the greatest pull is exerted thereon. Adjustment ot the shoes 4 tovary the time of magnetic excitation of the auxiliary pole pieces 12vand time of spark will not alter the intensity ot the spark. f

The armature 11 Amay be provided with a primary winding 22, as shown inFig. 3, which is grounded, and a secondary windf ing 23 on the armaturemay be connected at one end to the primary winding and thus grounded andits other end connected with the spark plug 24. rllhe primary circuit 22nea includes the sparking terminals 18 and 20, and a condenser 25 ispreferably connected in parallel with the contacts 18 and 2O topreventsparking at these contacts.

lig. 4 shows the armature as provided. with the primary winding 22aonly, there being an external transformer 26, the primary winding 2'?ofwhich is in circuit with the primary winding 22ZL and the secondarywinding 28 connects at'one end to the pri mary winding 28 and is theregrounded and thence is connected at its other end to the spark plug 211.

' 1n lFig. 6 the armature is shown as provided with a primary winding 29and a secondary winding 30,' botlroi' vwhich 'windings are separatedfrom each other.

18 and 2.0 are the contact points 'in each circuit` and4 25 is thecondenser. YThe sec ondary circuit 30 includes the spark plug Aall ofthese methodsot winding and their circuits are welllrnown in the art andany ot them may bc employed in'carrying out my invention.

'llhe armature winding may be taken otl' at one end by a brush 31asshown in Fig. 5, while 4the other yend may be conducted through thehollow shaft 9.

What ll claim is:

1. A magneto comprising a magnet, pole pieces on the magnet, adjustableshoeson the pole pieces, means tor adjusting the angular relationbetween the adjustable shoes and the pole pieces, an armature, a primarying and means operated by the pole pieces tor breaking the primarycircuit.

2. A. magneto comprising a magnet with pole pieces thereon, an armatureextending beyond the magnet, auxiliary pole pieces at one side of themagnet coperating with the extended portion ot said armature, a primaryand secondary circuit, `and means operated by said auxiliary pole piecestor breaking the primary circuit.

lfn testimony whereof, ll have hereunto set 24 day otiugust, 1909. lcanna. Jonsson.

v1n presence oit- G. 'll`. Hackney, FRANK A. GRAHAM.

winding on the armature, a secondary wind:

my hand at Los Angeles, Calit'ornia, this

